S3796: ignore returned Promise on async functions

[fxOne]

I want to report a bug.

SonarJS version: 3.3 (Build 5702)

SonarQube version: 6.7 (Build 33306)

Rule key: javascript:S3796

Reproducer

  return Promise.all([1,2].map(async (int) => { // False-positive here
    await asyncFunctionCall(int);
  }));

Expected behavior
There shouldn't be an Tickets as async function would return a Promise even if there is no return a the function.